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Difference between array and pointers in c plus plus?
A pointer is simply a variable that can store a memory address and has the same purpose in both languages. The only real difference is that C++ pointers can point at objects (instances of a class) and indirectly invoke their methods, whereas pointers in C (which is not object oriented) cannot.
What is pointer and pointer types and uses of pointer and the meaning of pointer?
The main advantages of using pointers are 1.) Function cannot return more than one value. But when the same function can modify many pointer variables and function as if it is returning more than one variable. 2.) In the case of arrays, we can decide the size of the array at runtime by allocating the necessary space. C has a minimum number of fundamental data types - a single character, a single integer or float, and a few derived data types such as a structure, an enumerated list, and an array. If you want to do much more than that, you make use of pointers. Pointers allow you to dynamically request memory to store off information for use later. They allow you to create linked lists and other algorithmically oriented data structures.
What is Normalization of pointers?
The 8085 had a 16-bit address bus thus it could address a maximum of 64KB of memory (2^16). The 8086 had a 20-bit address bus and could therefore address a maximum of 1MB of memory (2^20). To maintain compatibility, segmented memory was introduced, such that the segment and offset were stored in separate 16-bit registers. In order to perform 20-bit pointer arithmetic upon the 8086, the segment and offset had to be normalised by the compiler to produce a valid 20-bit address. This was achieved by left-shifting the segment by 4 bits and then adding on the offset. The 8086 also introduced the concept of near, far and huge pointers. A near pointer only stores the offset while far and huge pointers store both the segment and the offset. The only practical difference between far and huge pointers is in how pointer arithmetic works. With far pointers, only the offset is affected whereas with huge pointers, both the segment and the offset are affected.
How do you turn a positive integer into a negative integer in programming?
Store the absolute value of the desired integer in a variable. Multiply the absolute value by two. Substract the new integer by the old integer.
What is called pointers-c plus plus?
Yes, C++ has pointers, which are references to memory locations. which are variables that store memory addresses, or NULL (zero). If the pointer is non-NULL, the pointer is said to dereference the object (or variable) residing at the stored memory address, which permits indirect access to that object so long as the object remains in scope.
Where the pointers are used?
POINTERS ARE USED TO STORE ADDRESS
In pointers to store float address is we can use integer variable?
You can't address memory with floating point values. All pointers are integer values pointing to a location in memory, regardless of what type it is pointing to. If you wanted a floating point pointer, then the following should do the trick: float *floatingPointer; Note: If you wanted to ask that which integer type is big enough to hold a (flat) pointer, then the answer: ptrdiff_t, intptr_t (both signed) and size_t, uintptr_t (both unsigned).
Why pointers in c?
Pointers are variable that are used to point to the address of another variable. OR Pointers can also me defined as variables that are used to store address of another variable. They provide means through which the memory location of variable can be directly accessed and they also support dynamic allocation routines.
Is it true or false that assigning an address to a pointer variable is valid operation?
Pointers are meant to store adresses.
Difference between array and pointers in c plus plus?
A pointer is simply a variable that can store a memory address and has the same purpose in both languages. The only real difference is that C++ pointers can point at objects (instances of a class) and indirectly invoke their methods, whereas pointers in C (which is not object oriented) cannot.
What is pointer and pointer types and uses of pointer and the meaning of pointer?
The main advantages of using pointers are 1.) Function cannot return more than one value. But when the same function can modify many pointer variables and function as if it is returning more than one variable. 2.) In the case of arrays, we can decide the size of the array at runtime by allocating the necessary space. C has a minimum number of fundamental data types - a single character, a single integer or float, and a few derived data types such as a structure, an enumerated list, and an array. If you want to do much more than that, you make use of pointers. Pointers allow you to dynamically request memory to store off information for use later. They allow you to create linked lists and other algorithmically oriented data structures.
What is Normalization of pointers?
The 8085 had a 16-bit address bus thus it could address a maximum of 64KB of memory (2^16). The 8086 had a 20-bit address bus and could therefore address a maximum of 1MB of memory (2^20). To maintain compatibility, segmented memory was introduced, such that the segment and offset were stored in separate 16-bit registers. In order to perform 20-bit pointer arithmetic upon the 8086, the segment and offset had to be normalised by the compiler to produce a valid 20-bit address. This was achieved by left-shifting the segment by 4 bits and then adding on the offset. The 8086 also introduced the concept of near, far and huge pointers. A near pointer only stores the offset while far and huge pointers store both the segment and the offset. The only practical difference between far and huge pointers is in how pointer arithmetic works. With far pointers, only the offset is affected whereas with huge pointers, both the segment and the offset are affected.
Can you explain the difference between pointers and variables in programming languages?
In programming languages, variables are used to store data values, while pointers are variables that store memory addresses of other variables. Variables directly hold data, while pointers hold the location of where data is stored in memory.
Where do they sell laser pointers?
Any office supply store would carry them.
How do you turn a positive integer into a negative integer in programming?
Store the absolute value of the desired integer in a variable. Multiply the absolute value by two. Substract the new integer by the old integer.
What is the advantage of using pointer in c?
Pointer variables have many uses. Primarily, we use pointers to keep track of variables allocated on the heap (the free store). We cannot name these variables because they do not exist at compile time, so we must use pointer variables to store the addresses of these variables as and when they are allocated at runtime. Hence the return value of the C standard library malloc() function is a memory address. We also need to use pointers when passing arrays to and from functions because arrays cannot be passed by value, they can only be passed by reference. More generally, we can use pointers to pass and return any variable by reference, particularly large structures that would be too expensive to copy if passed by value. In C++ we can use native reference types rather than pointers, but in C there is no native reference type, so we must use pointers if we wish to work with memory addresses. We often use the term reference when referring to pointers in C, however there are important distinctions. Unlike a pointer, a reference is not a variable (it is an alias or alternate name for a memory address) and references can never be null. The null address (usually address 0) is a system address which we can assign to a pointer whenever we have no valid address to assign to it. Thus we can also use pointers as function arguments when "no object" may be a valid argument. Pointers and arrays are closely related in C. In some respects, an array name behaves like a reference in C++. That is, the name refers to the start address of the array (the address of the first element of the array). As such, the name and the address of the name are one and the same, as is the address of the first element: int a[100]; assert (a == &a); assert (a == &a[0]); The array subscript operator [] is nothing more than a sugar-coated abstraction to simplify the pointer arithmetic required to navigate an array. For any array a and any integer j within the range of a, we have the following equivalences: a[j] j[a] It often surprises people that a[j] and j[a] are equivalent, however the compiler will interpret j[a] as meaning *(j+a), which is nothing more than trivial pointer arithmetic. Such low-level cleverness does not belong in production code, of course.
How we use arithmetic operations with pointer?
pointers are used to store address of a variable and arithmatic operations can be easily done but these operations performed onthe address of variabe forex: #include<stdio.h> void main() { int a,*b,c; a=9; b=&a; c=b+1; }
